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s = 20 cm
Π = 3,14
t ?
k.alas = 2Πr
100,48 = 2.3,14r
100,48 = 6,28r
r = 100,48/6,28
r = 16
t=√s²-r²
t=√20²-16²
t=√400-256
t=√144
t=12 cm
jadi tingginya 12 cm